VFS-2.0-RC1/core/src/main/java/org/apache/commons/vfs/provider/http/HttpFileSystemConfigBuilder.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.vfs.provider.http;

import org.apache.commons.vfs.FileSystemConfigBuilder;
import org.apache.commons.vfs.FileSystemOptions;
import org.apache.commons.vfs.UserAuthenticator;
import org.apache.commons.httpclient.Cookie;
import org.apache.commons.httpclient.params.HttpConnectionManagerParams;

/**
 * Configuration options for HTTP.
 *
 * @author <a href="mailto:imario@apache.org">Mario Ivankovits</a>
 * @version $Revision$ $Date$
 */
public class HttpFileSystemConfigBuilder extends FileSystemConfigBuilder
{
    private static final HttpFileSystemConfigBuilder BUILDER = new HttpFileSystemConfigBuilder();

    private static final int DEFAULT_MAX_HOST_CONNECTIONS = 5;

    private static final int DEFAULT_MAX_CONNECTIONS = 50;
    
    private static final String OPTION_NAME__PREEMPTIVE_AUTHENTICATION = "preemptiveAuth";
    
	protected HttpFileSystemConfigBuilder(String prefix)
    {
        super(prefix);
    }

    private HttpFileSystemConfigBuilder()
    {
        super("http.");
    }

    public static HttpFileSystemConfigBuilder getInstance()
    {
        return BUILDER;
    }

    /**
     * Set the charset used for url encoding.<br>
     *
     * @param opts The FileSystem options.
     * @param chaset the chaset
     */
    public void setUrlCharset(FileSystemOptions opts, String chaset)
    {
        setParam(opts, "urlCharset", chaset);
    }

    /**
     * Set the charset used for url encoding.<br>
     *
     * @param opts The FileSystem options.
     * @return the chaset
     */
    public String getUrlCharset(FileSystemOptions opts)
    {
        return getString(opts, "urlCharset");
    }

    /**
     * Set the proxy to use for http connection.<br>
     * You have to set the ProxyPort too if you would like to have the proxy really used.
     *
     * @param opts The FileSystem options.
     * @param proxyHost the host
     * @see #setProxyPort
     */
    public void setProxyHost(FileSystemOptions opts, String proxyHost)
    {
        setParam(opts, "proxyHost", proxyHost);
    }

    /**
     * Set the proxy-port to use for http connection.
     * You have to set the ProxyHost too if you would like to have the proxy really used.
     *
     * @param opts The FileSystem options.
     * @param proxyPort the port
     * @see #setProxyHost
     */
    public void setProxyPort(FileSystemOptions opts, int proxyPort)
    {
        setParam(opts, "proxyPort", new Integer(proxyPort));
    }

    /**
     * Get the proxy to use for http connection.
     * You have to set the ProxyPort too if you would like to have the proxy really used.
     *
     * @param opts The FileSystem options.
     * @return proxyHost
     * @see #setProxyPort
     */
    public String getProxyHost(FileSystemOptions opts)
    {
        return getString(opts, "proxyHost");
    }

    /**
     * Get the proxy-port to use for http the connection.
     * You have to set the ProxyHost too if you would like to have the proxy really used.
     *
     * @param opts The FileSystem options.
     * @return proxyPort: the port number or 0 if it is not set
     * @see #setProxyHost
     */
    public int getProxyPort(FileSystemOptions opts)
    {
        return getInteger(opts, "proxyPort", 0);
    }

    /**
     * Set the proxy authenticator where the system should get the credentials from.
     * @param opts The FileSystem options.
     * @param authenticator The UserAuthenticator.
     */
    public void setProxyAuthenticator(FileSystemOptions opts, UserAuthenticator authenticator)
    {
        setParam(opts, "proxyAuthenticator", authenticator);
    }

    /**
     * Get the proxy authenticator where the system should get the credentials from.
     * @param opts The FileSystem options.
     * @return The UserAuthenticator.
     */
    public UserAuthenticator getProxyAuthenticator(FileSystemOptions opts)
    {
        return (UserAuthenticator) getParam(opts, "proxyAuthenticator");
    }

    /**
     * The cookies to add to the request.
     * @param opts The FileSystem options.
     * @param cookies An array of Cookies.
     */
    public void setCookies(FileSystemOptions opts, Cookie[] cookies)
    {
        setParam(opts, "cookies", cookies);
    }

    /**
     * The cookies to add to the request.
     * @param opts The FileSystem options.
     * @return the Cookie array.
     */
    public Cookie[] getCookies(FileSystemOptions opts)
    {
        return (Cookie[]) getParam(opts, "cookies");
    }

    /**
     * The maximum number of connections allowed.
     * @param opts The FileSystem options.
     * @param maxTotalConnections The maximum number of connections.
     */
    public void setMaxTotalConnections(FileSystemOptions opts, int maxTotalConnections)
    {
        setParam(opts, HttpConnectionManagerParams.MAX_TOTAL_CONNECTIONS, new Integer(maxTotalConnections));
    }

    /**
     * Retrieve the maximum number of connections allowed.
     * @param opts The FileSystemOptions.
     * @return The maximum number of connections allowed.
     */
    public int getMaxTotalConnections(FileSystemOptions opts)
    {
        return getInteger(opts, HttpConnectionManagerParams.MAX_TOTAL_CONNECTIONS, DEFAULT_MAX_CONNECTIONS);
    }

    /**
     * The maximum number of connections allowed to any host.
     * @param opts The FileSystem options.
     * @param maxHostConnections The maximum number of connections to a host.
     */
    public void setMaxConnectionsPerHost(FileSystemOptions opts, int maxHostConnections)
    {
        setParam(opts, HttpConnectionManagerParams.MAX_HOST_CONNECTIONS, new Integer(maxHostConnections));
    }

    /**
     * Retrieve the maximum number of connections allowed per host.
     * @param opts The FileSystemOptions.
     * @return The maximum number of connections allowed per host.
     */
    public int getMaxConnectionsPerHost(FileSystemOptions opts)
    {
        return getInteger(opts, HttpConnectionManagerParams.MAX_HOST_CONNECTIONS, DEFAULT_MAX_HOST_CONNECTIONS);
    }

    /**
     * Determines if the FileSystemOptions indicate that preemptive 
     * authentication is requested.
     * @param opts The FileSystemOptions.
     * @return true if preemptiveAuth is requested.
     */
    public boolean isPreemptiveAuth(FileSystemOptions opts) {
		return getBoolean(opts, OPTION_NAME__PREEMPTIVE_AUTHENTICATION, Boolean.FALSE).booleanValue();
	}

    /**
     * Sets the given value for preemptive HTTP authentication (using BASIC) on the
     * given FileSystemOptions object.  Defaults to false if not set.  It may be 
     * appropriate to set to true in cases when the resulting chattiness of the 
     * conversation outweighs any architectural desire to use a stronger authentication
     * scheme than basic/preemptive.
     * @param opts The FileSystemOptions.
     * @param preemptiveAuth the desired setting; true=enabled and false=disabled.
     */
	public void setPreemptiveAuth(FileSystemOptions opts, boolean preemptiveAuth) {
		setParam(opts, OPTION_NAME__PREEMPTIVE_AUTHENTICATION, Boolean.valueOf(preemptiveAuth));
	}

	protected Class getConfigClass()
    {
        return HttpFileSystem.class;
    }
}